1 2/* 3 * COMPILE WITH: 4 * gcc -Wall gen_md5.c -o gen_md5 5 */ 6 7 8/* taken from RFC-1321/Appendix A.3 */ 9 10/* 11 * MD5C.C - RSA Data Security, Inc., MD5 message-digest algorithm 12 */ 13 14/* 15 * Copyright (C) 1991-2, RSA Data Security, Inc. Created 1991. All rights 16 * reserved. 17 * 18 * License to copy and use this software is granted provided that it is 19 * identified as the "RSA Data Security, Inc. MD5 Message-Digest Algorithm" 20 * in all material mentioning or referencing this software or this function. 21 * 22 * License is also granted to make and use derivative works provided that such 23 * works are identified as "derived from the RSA Data Security, Inc. MD5 24 * Message-Digest Algorithm" in all material mentioning or referencing the 25 * derived work. 26 * 27 * RSA Data Security, Inc. makes no representations concerning either the 28 * merchantability of this software or the suitability of this software for 29 * any particular purpose. It is provided "as is" without express or implied 30 * warranty of any kind. 31 * 32 * These notices must be retained in any copies of any part of this 33 * documentation and/or software. 34 */ 35 36#include <stdio.h> 37 38#include "md5.h" 39 40/* 41 * Constants for MD5Transform routine. 42 */ 43#define S11 7 44#define S12 12 45#define S13 17 46#define S14 22 47#define S21 5 48#define S22 9 49#define S23 14 50#define S24 20 51#define S31 4 52#define S32 11 53#define S33 16 54#define S34 23 55#define S41 6 56#define S42 10 57#define S43 15 58#define S44 21 59 60static void MD5Transform(unsigned int[4], unsigned char[64]); 61static void Encode(unsigned char *, unsigned int*, unsigned int); 62static void Decode(unsigned int*, unsigned char *, unsigned int); 63static void MD5_memcpy(unsigned char *, unsigned char *, unsigned int); 64static void MD5_memset(char *, int, unsigned int); 65 66static unsigned char PADDING[64] = 67{ 68 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 69 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 70 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 71}; 72 73/* 74 * F, G, H and I are basic MD5 functions. 75 */ 76/* #define F(x, y, z) (((x) & (y)) | ((~x) & (z))) */ 77#define F(x, y, z) (((x) & (y)) | ((~x) & (z))) 78#define G(x, y, z) (((x) & (z)) | ((y) & (~z))) 79#define H(x, y, z) ((x) ^ (y) ^ (z)) 80#define I(x, y, z) ((y) ^ ((x) | (~z))) 81 82/* 83 * ROTATE_LEFT rotates x left n bits. 84 */ 85#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n)))) 86 87/* 88 * FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4. Rotation is 89 * separate from addition to prevent recomputation. 90 */ 91#define FF(a, b, c, d, x, s, ac) { (a) += F ((b), (c), (d)) + (x) + (unsigned int)(ac); (a) = ROTATE_LEFT ((a), (s)); (a) += (b); } 92#define GG(a, b, c, d, x, s, ac) { (a) += G ((b), (c), (d)) + (x) + (unsigned int)(ac); (a) = ROTATE_LEFT ((a), (s)); (a) += (b); } 93#define HH(a, b, c, d, x, s, ac) { (a) += H ((b), (c), (d)) + (x) + (unsigned int)(ac); (a) = ROTATE_LEFT ((a), (s)); (a) += (b); } 94#define II(a, b, c, d, x, s, ac) { (a) += I ((b), (c), (d)) + (x) + (unsigned int)(ac); (a) = ROTATE_LEFT ((a), (s)); (a) += (b); } 95 96/* 97 * MD5 initialization. Begins an MD5 operation, writing a new context. 98 */ 99void 100MD5Init(MD5_CTX * context) 101{ 102 context->count[0] = context->count[1] = 0; 103 /* 104 * Load magic initialization constants. 105 */ 106 context->state[0] = 0x67452301; 107 context->state[1] = 0xefcdab89; 108 context->state[2] = 0x98badcfe; 109 context->state[3] = 0x10325476; 110} 111 112/* 113 * MD5 block update operation. Continues an MD5 message-digest operation, 114 * processing another message block, and updating the context. 115 */ 116void 117MD5Update(MD5_CTX * context, unsigned char *input, unsigned int inputLen) 118{ 119 unsigned int i, index, partLen; 120 121 /* Compute number of bytes mod 64 */ 122 index = (unsigned int) ((context->count[0] >> 3) & 0x3F); 123 124 /* Update number of bits */ 125 if ((context->count[0] += ((unsigned int) inputLen << 3)) 126 < ((unsigned int) inputLen << 3)) 127 context->count[1]++; 128 context->count[1] += ((unsigned int) inputLen >> 29); 129 130 partLen = 64 - index; 131 132 /* 133 * Transform as many times as possible. 134 */ 135 if (inputLen >= partLen) { 136 MD5_memcpy(&context->buffer[index], input, partLen); 137 MD5Transform(context->state, context->buffer); 138 139 for (i = partLen; i + 63 < inputLen; i += 64) 140 MD5Transform(context->state, &input[i]); 141 142 index = 0; 143 } else 144 i = 0; 145 146 /* Buffer remaining input */ 147 MD5_memcpy(&context->buffer[index], &input[i], inputLen - i); 148} 149 150/* 151 * MD5 finalization. Ends an MD5 message-digest operation, writing the the 152 * message digest and zeroizing the context. 153 */ 154void 155MD5Final(unsigned char digest[16], MD5_CTX * context) 156{ 157 unsigned char bits[8]; 158 unsigned int index, padLen; 159 160 /* Save number of bits */ 161 Encode(bits, context->count, 8); 162 163 /* 164 * Pad out to 56 mod 64. 165 */ 166 index = (unsigned int) ((context->count[0] >> 3) & 0x3f); 167 padLen = (index < 56) ? (56 - index) : (120 - index); 168 MD5Update(context, PADDING, padLen); 169 170 /* Append length (before padding) */ 171 MD5Update(context, bits, 8); 172 /* Store state in digest */ 173 Encode(digest, context->state, 16); 174 175 /* 176 * Zeroize sensitive information. 177 */ 178 MD5_memset((char *) context, 0, sizeof(*context)); 179} 180 181/* 182 * MD5 basic transformation. Transforms state based on block. 183 */ 184static void 185MD5Transform(unsigned int state[4], unsigned char block[64]) 186{ 187 unsigned int a = state[0], b = state[1], c = state[2], d = state[3], x[16]; 188 189 Decode(x, block, 64); 190 191 /* Round 1 */ 192 FF(a, b, c, d, x[0], S11, 0xd76aa478); /* 1 */ 193 FF(d, a, b, c, x[1], S12, 0xe8c7b756); /* 2 */ 194 FF(c, d, a, b, x[2], S13, 0x242070db); /* 3 */ 195 FF(b, c, d, a, x[3], S14, 0xc1bdceee); /* 4 */ 196 FF(a, b, c, d, x[4], S11, 0xf57c0faf); /* 5 */ 197 FF(d, a, b, c, x[5], S12, 0x4787c62a); /* 6 */ 198 FF(c, d, a, b, x[6], S13, 0xa8304613); /* 7 */ 199 FF(b, c, d, a, x[7], S14, 0xfd469501); /* 8 */ 200 FF(a, b, c, d, x[8], S11, 0x698098d8); /* 9 */ 201 FF(d, a, b, c, x[9], S12, 0x8b44f7af); /* 10 */ 202 FF(c, d, a, b, x[10], S13, 0xffff5bb1); /* 11 */ 203 FF(b, c, d, a, x[11], S14, 0x895cd7be); /* 12 */ 204 FF(a, b, c, d, x[12], S11, 0x6b901122); /* 13 */ 205 FF(d, a, b, c, x[13], S12, 0xfd987193); /* 14 */ 206 FF(c, d, a, b, x[14], S13, 0xa679438e); /* 15 */ 207 FF(b, c, d, a, x[15], S14, 0x49b40821); /* 16 */ 208 209 /* Round 2 */ 210 GG(a, b, c, d, x[1], S21, 0xf61e2562); /* 17 */ 211 GG(d, a, b, c, x[6], S22, 0xc040b340); /* 18 */ 212 GG(c, d, a, b, x[11], S23, 0x265e5a51); /* 19 */ 213 GG(b, c, d, a, x[0], S24, 0xe9b6c7aa); /* 20 */ 214 GG(a, b, c, d, x[5], S21, 0xd62f105d); /* 21 */ 215 GG(d, a, b, c, x[10], S22, 0x2441453); /* 22 */ 216 GG(c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */ 217 GG(b, c, d, a, x[4], S24, 0xe7d3fbc8); /* 24 */ 218 GG(a, b, c, d, x[9], S21, 0x21e1cde6); /* 25 */ 219 GG(d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */ 220 GG(c, d, a, b, x[3], S23, 0xf4d50d87); /* 27 */ 221 GG(b, c, d, a, x[8], S24, 0x455a14ed); /* 28 */ 222 GG(a, b, c, d, x[13], S21, 0xa9e3e905); /* 29 */ 223 GG(d, a, b, c, x[2], S22, 0xfcefa3f8); /* 30 */ 224 GG(c, d, a, b, x[7], S23, 0x676f02d9); /* 31 */ 225 GG(b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 */ 226 227 /* Round 3 */ 228 HH(a, b, c, d, x[5], S31, 0xfffa3942); /* 33 */ 229 HH(d, a, b, c, x[8], S32, 0x8771f681); /* 34 */ 230 HH(c, d, a, b, x[11], S33, 0x6d9d6122); /* 35 */ 231 HH(b, c, d, a, x[14], S34, 0xfde5380c); /* 36 */ 232 HH(a, b, c, d, x[1], S31, 0xa4beea44); /* 37 */ 233 HH(d, a, b, c, x[4], S32, 0x4bdecfa9); /* 38 */ 234 HH(c, d, a, b, x[7], S33, 0xf6bb4b60); /* 39 */ 235 HH(b, c, d, a, x[10], S34, 0xbebfbc70); /* 40 */ 236 HH(a, b, c, d, x[13], S31, 0x289b7ec6); /* 41 */ 237 HH(d, a, b, c, x[0], S32, 0xeaa127fa); /* 42 */ 238 HH(c, d, a, b, x[3], S33, 0xd4ef3085); /* 43 */ 239 HH(b, c, d, a, x[6], S34, 0x4881d05); /* 44 */ 240 HH(a, b, c, d, x[9], S31, 0xd9d4d039); /* 45 */ 241 HH(d, a, b, c, x[12], S32, 0xe6db99e5); /* 46 */ 242 HH(c, d, a, b, x[15], S33, 0x1fa27cf8); /* 47 */ 243 HH(b, c, d, a, x[2], S34, 0xc4ac5665); /* 48 */ 244 245 /* Round 4 */ 246 II(a, b, c, d, x[0], S41, 0xf4292244); /* 49 */ 247 II(d, a, b, c, x[7], S42, 0x432aff97); /* 50 */ 248 II(c, d, a, b, x[14], S43, 0xab9423a7); /* 51 */ 249 II(b, c, d, a, x[5], S44, 0xfc93a039); /* 52 */ 250 II(a, b, c, d, x[12], S41, 0x655b59c3); /* 53 */ 251 II(d, a, b, c, x[3], S42, 0x8f0ccc92); /* 54 */ 252 II(c, d, a, b, x[10], S43, 0xffeff47d); /* 55 */ 253 II(b, c, d, a, x[1], S44, 0x85845dd1); /* 56 */ 254 II(a, b, c, d, x[8], S41, 0x6fa87e4f); /* 57 */ 255 II(d, a, b, c, x[15], S42, 0xfe2ce6e0); /* 58 */ 256 II(c, d, a, b, x[6], S43, 0xa3014314); /* 59 */ 257 II(b, c, d, a, x[13], S44, 0x4e0811a1); /* 60 */ 258 II(a, b, c, d, x[4], S41, 0xf7537e82); /* 61 */ 259 II(d, a, b, c, x[11], S42, 0xbd3af235); /* 62 */ 260 II(c, d, a, b, x[2], S43, 0x2ad7d2bb); /* 63 */ 261 II(b, c, d, a, x[9], S44, 0xeb86d391); /* 64 */ 262 263 state[0] += a; 264 state[1] += b; 265 state[2] += c; 266 state[3] += d; 267 268 /* 269 * Zeroize sensitive information. 270 */ 271 MD5_memset((char *) x, 0, sizeof(x)); 272} 273 274/* 275 * Encodes input (unsigned int) into output (unsigned char). Assumes len is a 276 * multiple of 4. 277 */ 278static void 279Encode(unsigned char *output, unsigned int * input, unsigned int len) 280{ 281 unsigned int i, j; 282 283 for (i = 0, j = 0; j < len; i++, j += 4) { 284 output[j] = (unsigned char) (input[i] & 0xff); 285 output[j + 1] = (unsigned char) ((input[i] >> 8) & 0xff); 286 output[j + 2] = (unsigned char) ((input[i] >> 16) & 0xff); 287 output[j + 3] = (unsigned char) ((input[i] >> 24) & 0xff); 288 } 289} 290 291/* 292 * Decodes input (unsigned char) into output (unsigned int). Assumes len is a 293 * multiple of 4. 294 */ 295static void 296Decode(unsigned int * output, unsigned char *input, unsigned int len) 297{ 298 unsigned int i, j; 299 300 for (i = 0, j = 0; j < len; i++, j += 4) 301 output[i] = ((unsigned int) input[j]) | (((unsigned int) input[j + 1]) << 8) | 302 (((unsigned int) input[j + 2]) << 16) | (((unsigned int) input[j + 3]) << 24); 303} 304 305/* 306 * Note: Replace "for loop" with standard memcpy if possible. 307 */ 308 309static void 310MD5_memcpy(unsigned char *output, unsigned char *input, unsigned int len) 311{ 312 unsigned int i; 313 for (i = 0; i < len; i++) 314 output[i] = input[i]; 315} 316 317/* 318 * Note: Replace "for loop" with standard memset if possible. 319 */ 320static void 321MD5_memset(char *output, int value, unsigned int len) 322{ 323 unsigned int i; 324 for (i = 0; i < len; i++) 325 output[i] = (char) value; 326} 327 328/* 329static void 330MDString(char *string, size_t len) 331{ 332 MD5_CTX context; 333 unsigned char digest[16]; 334 MD5Init(&context); 335 MD5Update(&context, string, len); 336 MD5Final(digest, &context); 337 printf("%s\t", string); 338 MDPrint(digest); 339 printf("\n"); 340} 341*/ 342/* 343static void 344MDPrint(unsigned char digest[16]) 345{ 346 unsigned int i; 347 for (i = 0; i < 16; i++) 348 / printf("%02x", digest[i]); * 349 printf("%c", digest[i]); 350} 351*/ 352 353